<template>
  <div>
    <!-- //面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert
        :closable="false"
        show-icon
        title="注意:只允许为第三级分类设置参数！"
        type="warning"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row>
        <el-col class="el-row">
          <span>选择商品分类:</span>
          <!-- 选择商品分类级联选择框 -->
          <el-cascader
            expandTrigger="hover"
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          >
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button
            :disabled="isBtnDisabled"
            type="primary"
            size="mini"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  closable
                  @close="handleClose(i, scope.row)"
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                >
                  {{ item }}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  @click="showEditDialog(scope.row.attr_id)"
                  icon="el-icon-edit"
                  size="mini"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性按钮 -->
          <el-button
            :disabled="isBtnDisabled"
            type="primary"
            size="mini"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  closable
                  @close="handleClose(i, scope.row)"
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                >
                  {{ item }}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加属性/参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      @close="addCateDialogClosed"
      :visible.sync="addDialogVisible"
      width="50%"
    >
      <!-- 添加参数对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      @close="editCateDialogClosed"
      :visible.sync="editDialogVisible"
      width="50%"
    >
      <!-- 添加参数对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      // 商品列表
      cateList: [],
      //级联选择框配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //处于活跃状态的名称
      activeName: "many",
      //动态参数的数据
      manyTableData: [],
      //静态属性的数据
      onlyTableData: [],
      //添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数表单数据对象
      addForm: {
        attr_name: "",
      },
      //添加表单规则验证对象
      addFormRules: {
        attr_name: [{ required: true, message: "请输入参数名称", trigger: "blur" }],
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //修改参数表单数据对象
      editForm: {
        attr_name: "",
      },
      //修改表单规则验证对象
      editFormRules: {
        attr_name: [{ required: true, message: "请输入参数名称", trigger: "blur" }],
      },
    };
  },
  created() {
    this.getCateList();
  },
  computed: {
    //如果按钮需要被禁用则返回true，否则返回fale
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    //当前选中的三级分类ID
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    //判断对话框的提示信息
    titleText() {
      if (this.activeName === "many") return "动态参数";
      else {
        return "静态属性";
      }
    },
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) return this.$message.error("商品列表获取失败");
      this.cateList = res.data;
      console.log(this.cateList);
    },
    //级联选择框选中项变化会触发
    handleChange() {
      this.getParamsData();
    },
    //获取参数的列表数据
    async getParamsData() {
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      //证明选中的是三级分类
      console.log(this.selectedCateKeys);
      //根据所选分类的ID和当前所处的面板获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName },
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取失败");
      }
      //将attr_vals中的字符串转换成数组
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(",") : [];
        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //文本框中输入的值
        item.inputValue = "";
      });

      console.log(res.data);
      //做一个判断当前正处于那个区域
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    //tab页签点击事件处理函数
    handleTabClick() {
      this.getParamsData();
      console.log(this.activeName);
    },
    //监听对话框的关闭事件
    addCateDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    //点击按钮添加参数
    addParams() {
      //先进行表单的预验证
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败");
        }
        this.$message.success("添加参数成功");
        this.getParamsData();
        this.addDialogVisible = false;
      });
    },
    //点击按钮展示修改的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的id
      console.log(attr_id);
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    //监听对话框的关闭事件
    editCateDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    //点击确定验证表单
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const {
          data: res,
        } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.editForm.attr_sel }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("更新失败");
        }
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    //根据ID删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      console.log(confirmResult);
      //用户取消了删除操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消了删除");
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除失败");
      }
      this.$message.success("删除成功");
      this.getParamsData();
    },
    //文本框失去焦点或按下enter键都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        (row.inputValue = ""), (this.inputVisible = false);
        return;
      }
      //如果没有return则整明输入的合法，需要做进一步处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      //需要发送请求保存这次操作
      this.saveAttrValus(row);
    },
    //将对attr_vals操作保存到数据库
    async saveAttrValus(row) {
      //需要发送请求保存这次操作
      const { data: res } = await this.$http.put(
        `categories/
      ${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(","),
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败");
      }
      this.$message.success("修改参数项成功");
    },
    //点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      //让文本框自动获得焦点
      //$nextTick 方法 的作用，就是当页面上元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrValus(row);
    },
  },
};
</script>

<style lang="less" scoped>
.el-row {
  margin-top: 10px;
}
.el-tag {
  margin: 10px 20px;
}
.input-new-tag {
  width: 150px;
}
</style>
